diff --git a/packages/telemetry/src/flight-recorder.js b/packages/telemetry/src/flight-recorder.js
index afddada5fbab..254acad53139 100644
--- a/packages/telemetry/src/flight-recorder.js
+++ b/packages/telemetry/src/flight-recorder.js
@@ -272,18 +272,18 @@ export const makeSimpleCircularBuffer = async ({
  * @param {Pick<Awaited<ReturnType<typeof makeSimpleCircularBuffer>>, 'writeCircBuf'>} circBuf
  */
 export const makeSlogSenderFromBuffer = ({ writeCircBuf }) => {
-  let writes = [];
+  let toWrite = Promise.resolve();
   const writeJSON = (obj, serialized = serializeSlogObj(obj)) => {
     // Prepend a newline so that the file can be more easily manipulated.
     const data = new TextEncoder().encode(`\n${serialized}`);
     // console.log('have obj', obj, data);
-    writes.push(writeCircBuf(data));
+    toWrite = toWrite.then(() => writeCircBuf(data));
   };
   return Object.assign(writeJSON, {
     forceFlush: async () => {
-      const flushing = [...writes];
-      writes = [];
-      return Promise.all(flushing).then(() => {});
+      const writing = toWrite;
+      toWrite = Promise.resolve();
+      await writing;
     },
     usesJsonObject: true,
   });